题目内容

(2004?北塘区)
32×40+450÷18
3
11
+
3
5
+
8
11
+
2
5
(6-1.3×4)÷0.1
13.7×1.4-3.7×1.4 (
2
3
+
6
7
×
7
24
11
32
5
6
-[(
1
5
+
1
3
8
9
]
分析:(1)先算乘除,再算加法;
(2)运用加法交换律与结合律简算;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法;
(4)运用乘法分配律简算;
(5)先算括号内的乘法,再算括号内的加法,最后算括号外的除法;
(6)先算小括号内的,再算中括号内的,最后算括号外的减法.
解答:解:(1)32×40+450÷18,
=1280+25,
=1305;

(2)
3
11
+
3
5
+
8
11
+
2
5

=(
3
11
+
8
11
)+(
2
5
+
3
5
),
=1+1,
=2;

(3)(6-1.3×4)÷0.1,
=(6-5.2)÷0.1,
=0.8÷0.1,
=8;

(4)13.7×1.4-3.7×1.4,
=(13.7-3.7)×1.4,
=10×1.4,
=14;

(5)(
2
3
+
6
7
×
7
24
)÷
11
32

=(
2
3
+
1
4
)×
32
11

=
11
12
×
32
11

=
8
3


(6)
5
6
-[(
1
5
+
1
3
)÷
8
9
],
=
5
6
-
8
15
÷
8
9

=
5
6
-
8
15
×
9
8

=
5
6
-
3
5

=
7
30
点评:此题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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